So currently shotgun and revolver reloads are a little unrealistic, you must unload a shotgun completely to reload. I was thinking, what if SELECT types of magazines (lever actions, pump actions, cylinder loading guns, ect) Loaded one round at a time? Perhaps keep for instance, a standard 6 shell shotgun have the same ammo, but instead of reloading all 6 for a huge cost, enable loading just 1 for a smaller cost, like 7 - 10 tus?
This would enable a few things. First, you could have more unwieldy guns (loading a cylinder grenade launcher slower, but enabling flexibility, juggling shotgun shells to shoot) and possibly, having guns with limited capacity, but larger ammo? (imagine a pellet gun, with a tin of 50 shots, but you load 1 at a time).
Could be interesting for variance, and I don't think would be too difficult.